soybean growth stages chad lee, ph.d. grain crops extension specialist university of kentucky
TRANSCRIPT
Soybean Growth Soybean Growth StagesStages
Chad Lee, Ph.D.Chad Lee, Ph.D.
Grain Crops Extension Grain Crops Extension SpecialistSpecialist
University of Kentucky University of Kentucky
► How a Soybean Plant Develops, Special Report No. How a Soybean Plant Develops, Special Report No. 5353
► Iowa State University PressIowa State University Press► $2.00$2.00
Extension Distribution CenterExtension Distribution Center119 Printing and Publications Building119 Printing and Publications BuildingIowa State UniversityIowa State UniversityAmes, Iowa 50011-3171 Telephone: (515) 294-5247Ames, Iowa 50011-3171 Telephone: (515) 294-5247Fax: (515) 294-2945Fax: (515) 294-2945
http://www.extension.iastate.edu/Pages/hancock/http://www.extension.iastate.edu/Pages/hancock/agriculture/soybean/bean_develop/agriculture/soybean/bean_develop/
The information in the presentation comes from Iowa State Special Report No.53. This is an excellent resource for any producer or agronomist.
Vegetative StagesVegetative Stages Reproductive StagesReproductive Stages
VE VE R1R1
VC VC R2R2
V1 V1 R3R3
V2V2 R4R4
V3V3 R5R5
V(n)V(n) R6R6
R7R7
R8R8
Vegetative StagesVegetative Stages Reproductive StagesReproductive Stages
VE – emergenceVE – emergence R1 – beginning bloomR1 – beginning bloom
VC – cotyledonVC – cotyledon R2 – full bloomR2 – full bloom
V1 – 1V1 – 1stst node node R3 – beginning podR3 – beginning pod
V2 – 2V2 – 2ndnd node node R4 – full podR4 – full pod
V3 – 3V3 – 3rdrd node node R5 – beginning seedR5 – beginning seed
V(n) – nV(n) – nthth node node R6 – full seedR6 – full seed
R7 – beginning maturityR7 – beginning maturity
R8 – full maturityR8 – full maturity
V2V2Rhizobia have colonized the roots.Rhizobia have colonized the roots.
N – fixation has begun.N – fixation has begun.
The roots are growing through the top 6 inches of soil.The roots are growing through the top 6 inches of soil.
V5V5 V6V6
Axillary Buds
1)1) Form flowers that develop into podsForm flowers that develop into pods2)2) Form axillary stems, which form more axillary budsForm axillary stems, which form more axillary buds3)3) Remain dormantRemain dormant
V5V5 V6V6Apex
(Growing Point)
1)1) Dominant in vegetative growth (plant will grow Dominant in vegetative growth (plant will grow up before growing out)up before growing out)
2)2) If the apex is destroyed, the axillary buds will If the apex is destroyed, the axillary buds will produce many stems, causing the plant to “bush produce many stems, causing the plant to “bush out”.out”.
R4 – Full PodR4 – Full Pod
Start of the most critical period for yield determination.
From R4 through R6, yield potential is more susceptible to stress than any other period.
Vegetative StagesVegetative Stages Reproductive StagesReproductive Stages
VE – emergenceVE – emergence R1 – beginning bloomR1 – beginning bloom
VC – cotyledonVC – cotyledon R2 – full bloomR2 – full bloom
V1 – 1V1 – 1stst node node R3 – beginning podR3 – beginning pod
V2 – 2V2 – 2ndnd node node R4 – full podR4 – full pod
V3 – 3V3 – 3rdrd node node R5 – beginning seedR5 – beginning seed
V(n) – nV(n) – nthth node node R6 – full seedR6 – full seed
R7 – beginning maturityR7 – beginning maturity
R8 – full maturityR8 – full maturity